#! /usr/bin/env python3

a = 21
b = 10
c = 0

c = a + b
print ("1 - c 的值为：", c)  # 31

c = a - b
print ("2 - c 的值为：", c) # 11

c = a * b
print ("3 - c 的值为：", c) # 210

c = a / b
print ("4 - c 的值为：", c) # 2.1

c = a % b
print ("5 - c 的值为：", c) # 1

# 修改变量 a 、b 、c
a = 2
b = 3
c = a**b
print ("6 - c 的值为：", c) # 8

a = 13
b = 5
c = a//b
print ("7 - c 的值为：", c) # 2


del a,b   # 删除变量引用
